Piston-ring.



- E. c. BLOMBERG.

PISTON RING. y l. APPLICATION FILED JAN-19. 1915..

.21:,2-002701-.11 Patented (M. 10,1916.

l Z7 ZZ -a citizen of the United States, residing at f nnwin c. anciennes, or nocmonn, miniers.

risfronnme.

Lerici.

stamane-ntf Letters raient.

appiicaapn sies 'refinery ia, ieie. serial N6. vases.

To blt whom t may concern i Be it known that EFDWIN BLoMBnRG,

Rockford, Winnebago county, illinois, have invented certain new anduseful Improvements in Piston-Rings, of which the following is a specification.

A My invention-relates to improvements inY piston ringconstruction,

ject a' more fluidl tight ends of piston rinfs of the type where the joint is formed by ring into each other. rAnd with this object in view the invention consists in the novel. construction, combination and arrangement 3 is a section of a broken away portion of the ring. Fig. 4 is a perspective view of the parts shown in Fig. 43. Fig.' 5 is an enlargedperspective view of the parts shown in Fig. 4 separated. Fig. 6 is a side view the meeting ends of the ring of Fig. 4 with separated to substantially the maximum extent, showing' the overlapping insert piece as overlapping the separated ends equally. 1n the severai views 2 and 3 represent an inner and an outer ring welded together, orV

otherwise made one, after each has had its ends slotted as shown. rihe two rings mayalsobe a single ring, aitiiengh the construction is, perhaps, most conveniently made by having the rings separate until their ends are cut'to form the joint.

The essential improvement resides in the present instance in a slot formed on the inner ring portion 2, the bottom of said slot having an arc of curvature that is smaller than the arc of the body of the'ring. andin which keeps the bottom an insert piece,` or joint overlapping' portion which has a corresponding curvature for its bottom face kwhich makes the radial end cross sections cross section whereby the guter'face ofthe insert piece' tends to Yproject-beyond the outer face of the body of the ring when the latter is expanded by a wedge-like action faceof the'insert and has Jfor its ob-v joint between v*the letting the ends of the ylargerfthan the middlel Patented Oct.; 1), 1916i 'always ini-close Contact with the bottom of' the slotin which it ismouiited.^ 1

The ends of the i :er lsection 2 'of the packing ring are'beveled as atii. and`5, the beveled surfaces beingy paralleliand/ tting closelyv when the ring is in its' closed posi- .tion as in Fig. 4.' y11i-one endof the outer ring section 3'is a'slot br mortise 6 ,which goes through the outer ringsectionradially and makes branches 7 and 8. The ends o'f the 'latter are cut square to it against and 10 formed by the opposite-end of the it in the form of a fork with abutments 9. i

outer section 3. bythe formation of a slot- 11 therein correspondingto, but shorter than,'the slot 6, and by a vportion 12 projects the/ end ofthe inner section 2 beyoud the end 9, 10 of the outer section,v The inner end of the slot 11 is beveledas at 12, which beveled portion extends to the bottom of a slot 13' formedv in the innersection 2 inlone of vits ends andcontinued in a slot 14 in its opposite end, the endk of which is a beveled portin or inclined wall 15 like the wall 12 but oppositely inclined. An insert piece or ring section 16 is fitted into the slots 6', 11, 13 and 14 and has bev eled ends 17 and 18 which Iiengainst and parallel, respectively, the surfaces' 1 5 and 12 when the ring is closed as in Figs. 1 and 4. When thus closed ,the and. 14 is curved 'on a shorterl radius vthan the radius of theinner or outercircle 'of-the bottom of slots 13 erA ring as a whole. 0n the insert 16 in Fig.v 5:

the numeral 19 indicates its curved bottom-' face. The outer face 20 curvature of the vin- 'sert 16 corresponds to the arcfoi curvature of thel outer circle of the ring and is repre-A sented by insert 16 slightly wedge form from each of its -ends toward its middle portion asclearly shown in Fig. 5, as well asin Fig.-3, and when the ring is expanded, or ,its ends 'are separated, the insert 16 which in Fig. 4'has its-outer surface flush with the outer surface of the ring, is forced outwardly as indicated in Fig. 3 and gaps l21 andf22'are formed be tween the ends 17 and 18 and the beveled portion of the insert 16 will be. opposite a gap'23 formed betweenthe ends' 4 and 5 of the inner rin g,f`` section 2. In other words this construction prevents all of the gap be- -ing formed at one end only of theinsert, as:

thenumeral 20. This makesthe.

loof

ies

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teven when the violent Wear and tear on a piston ring makes 1t otherwise loose and worn.

It has been found that even with moi-tiscand-tenoriv joints of the various forms heretofore pr0vided,that is, the forms which,

structurallhave been found commercially practicable,-se1ious leakages have taken place. Others, While theoretically efficient, have for manufacturersv reasons failed of adoption. In the present invention the short ring section, or insert 16, is designed to accomplish a better joint closure than an insert in the form of a. complete ring let into another ring, or as short inserts of prior forms. The relative curvatures of the arcs of respectively the body of the ring and the inner face of the insert and the curved surface it contacts will loe correctly iigured out for each individual case, especially Where the same size of packing ring is to be used for different cylinder diameters.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- Ihe combination with a packing ring having reduced cud portions two of which have luex'eflcd meeting edges and the other two square meeting edges, of a slot extending across the lines of junction of the meeting ends of saidv reduced portions formed in the outer peripheral face of the ring and extending into said reduced portions, and an insert strip/ in said slot, the bottom of said slot and the inner face of said insert being curved on an arc of shorter radius than the arc'of curvature of said ring.

In testimony whereof I have hereunto signed my name.

EDWIN C. BLOMBERG., 

